ICD-10-CM > S00-T88 > T36-T50 > T38 > T38.9 > T38.90 > T38.906 T38.906 Underdosing of unspecified hormone antagonists Non-Billable/Non-Specific Codes T38.906A..., initial encounterT38.906D..., subsequent encounterT38.906S..., sequela